Cadillac STS Forum - 2005 through 2012 Discussion, 2005 STS won't start in Past Cadillac Vehicle Discussion; I let my 2005 STS sit without being started for over a month while being on mission. I went to ...

Re: 2005 STS won't start

Depends on how old the battery is. I wouldn't replace it just yet unless it the original Delco or is close to four years old. First fully charge on a charger and then take it to Advance or Firestone and have them load test it. If it doesn't have a bad cell, don't worry about it. If it happens again, replace it. I favor Firestone beacause they carry an Interstate battery that is an exact fit. I wouldn't buy an Delco.

Re: 2005 STS won't start

Took it to Auto Zone and had it charged.....still won't start. I don't know what to do. When i attempt to statr it i hear a click and then the dash just goes blank. I have never had any problems with my ride.

Re: 2005 STS won't start

Did they do a load test at Autozone? Even if it tested OK, it still could be the battery. These cars are very particular about the battery. Do the headlights work and are they bright. If so, sound like a possible short in the starting system. I would still rule out the battery first. Good luck.

Corrosion can be a killer. Clean the battery terminals and cables, check the relay center under the hood to see if there is corrosion on those cables as well. Just a little bit of it caused starting issues with my 02 DTS. Starter isn't cheap or easy on the northstar and I hear they rarely go out since they are so protected due to their location.